Tripping device for shovel-dipper doors.



move to this position of Fig. the weighted arm l2 naturally swings tothe vertical position illustrated and that the door is swung shut. Iheavy lctch falls by gravity into locking position. Similarly whenthearni 1Q swings ii. triie farther to Athe right the end ojl' the armor lever ll is engaged by the catch lei. and the parts are in theposition it'or a repetition of the operation theretofore described whenthe dipper handle and dipper move to their lateral' position asindicated in Fig. l. The engagement of the latch 1l with the end of thearm l1 is insured, since in the normal operation 'of the device, theclipper is swung to the left of the vertical position.

indicated in Fig. 3, thus making certain that the catch will properlyengage.

ln the modilication oi' Fig. l`l, the ball 22 takes the place of theweight 13 of the other construction. This ball is mounted in thecylinder 33, and when the flipper handle 2x3: is in its horizontalposition., the ball is held in the position illustrated thc catch 25.When the catch is released by the solenoid 26, the hall drops strikingthe inenibei-fl and actuating the bell ci'anl' 28 to pull the connection29 and withdraw the di pper door latch. The operation oitl setting thedevice when the handle is swung to a vertical position is similar tothat already' described tively elevated position, connections torwithdrawing the said latch ari-anged so 4as to be operated by the saidweight Whenfitv released., and means tor releasing the said catch topermit the weight to 'tall and opferatc the connections to withdraw.said latch,

t ie parts being arranged so thatfthe inovement of the dippei' tosubstantially upright position serves to return the weight to itsoriginal. position with respect to the catch and dipper.

2. 'lf he combination with .ya di pper .having 5t/'hen the door 3 swingsshut theA the said latch, the movement 'oilth'e dipper to uprightposition serving' to return the said' arm with 'its weight to itsoriginal position with respect to the catch and dlpper.

3. ln combination, a dipper mounted for movement so as to'occupy eitheran upright or a lateral position, a door hinged to the dipper andconstituting the bottom thereof, a latch which locks automatically whenthe door is closed, apivoted arm provided with an operating weight andextendingT laterally when the clipper occupies its lateral position, aconnection from the arm to the said latch, acatch ormaintaining thearm'in `its lateral position, and means for withdrawing the catch topermit the weight to swing the said arm andwvithdrnw theI said latch.the

said catch vbeing adapted to automatically rengage when the dipper movesto its vertiv cal position and the door is latchcd.

ll. 'lhecombination with a dipper having a door and a latch therefor,and mounted for movement so as to occupy either an upright or a lateral.posit-ion, of a weighted arm' which occupies an' upright position whenthe Clipper is in its upright position, an automatic catch which'holdsthe arm against movement with respect to the dippe as -the dipper andarmv are moved to their lateral positions, means for releasing thecatch.' and lconm-actions between lthe said latch and the.

arm whereby the latch is withdrawn as the 'weighted arm swings toitsupright-position.

1n testimony whereof l"'ha \e hereunto signed my name in the presence ofthe two subscribed witnesses. p

FRANK H'. ARMSTRONG. Witnesses n T. R. TRUncicoN, lILLLi'M KELLEY.

